Convertible two to four cycle gas-engine.



0. P, HOPEWELL. CONVERTIBLE TWO TO FOUR CYCLE GAS ENGINE.

APPLIOATION I'ILED MAY 13, 1904.

991,03, Patented May 2, 1911.

4 SHEETS-SHEET 1.

WITHESSEE i I IvErJ'm I I E'I- lv B H15 RTTEIRNEY 49W 0. P. HOPEWELL.CONVERTIBLE TWO TO FOUR CYCLE GAS ENGINE.

APPLICATION FILED MAY 13, 1904.

Patented May 2,1911.

4 SHEETSSHEET 2.

Fla. 2

WITNEESES im mw C. F. HOPE-WELL. CONVERTIBLE TWO TO FOUR CYCLE GASENGINE.

APPLICATION EILEfi MAY 13, 1904.

991,063. Patented May 2; 1 911 SHEETSSHEET 3.

af w/m b -W I (9 g Wwflessrzs INVEHTDK By H' W N Y 0. F. HOPEWELL.CONVERTIBLE TWO T0 FOUR CYCLE GAS ENGIlUEL APPLICATION FILED MAY 13,1904.

Patented May 231911.

4 SHEETS-SIIEET 4.

I !/lllllllllllfllll/ V W 7 Q'N N R' I T 4% j f W I ans? oonvnmrrstn TWOesLoca To all whom it may concern: 7 X

Be it known that I, CHARLES F. Horn- WELL, of Cambridge, in the countyof Middlesexand State of Massachusetts, have invented certain newanduseful Improvements in Convertible Two .to Four Cycle Gas- Engines,of which the following is a specification. p

This invention seeks to combine in a single' hydrocarbon explosionengine the phases of both the two cycle and the four cycle types. Itseeks further to make these two sets of phases interchangeable. Thephases may be changed either by hand or by automatic means. It isgenerally understood that a four cycle engine is the more economical inthe use of fuel than the two cycle engine, while the two cycle in turnis capable of developing greater power weight for weight than the fourcycle type. Mymvention seeks ,to combine both these. advantages in one'engine. The alteration of the phases fromthe two cycle sequence to thefour cycle sequence may be accomplished by manual means such as thethrow of a lever by hand, or it may be accomplished automatically by agovernor which" acts when the-engine slows down due to the imposition ofa greater load uponit. In power station for illustration, whenoverloaded, the greater load imposed upon the engine causes it to slowdown. vThis'automatically converts the four cycle enginejinto a twocycleengine. When running on the" usual load theengine speeds up again andthis causes the engine to be automatically switched over 'to-thefourcycle type. Y In: the accompanying part of this specification, in whichsimilar fthe diflierent figures: Figure" 1 is a front elevation withdrawlngs forming a letters ofreference refer to similar parts in arts insection; Fig. 2 is a side elevation; ig. 3is a plan view of the governorwith connecting" levers omitted; Fig. 4 is a part sectional viewof the;gove'rnor; Fig. 5 is a diagram ofjthe ga's passages and valves, thefeatures of 'actualcon struction being omitted toflavoid confusion:

" The sua ype of four cycle engineis used for illustrating myninvention,there being. the usual puppet: valves, cam shaft, and '-gear.' drivebetween the main shaft and the cam. shaft. In order to convenientlychange'the" speedofi the cam shaft a lanet-.

ary type of gear hasbeen found e ective.

Specification of Letters Patent.

TO FOUR CYCLE GAS-ENGINE.

Patented May 2,1911.

Application filed May 13, 1904. Serial No. 207,746...

By means of this gear the speed of the cam shaft may be altered from thefour cycle speed which calls for one revolution of the cam shaft forevery two revolutions of the main shaft; to the two cycle speed whichcalls for arevolution of the cam shaft for each .revolution of the mainshaft. At the same time the valves must be switched to accommodate theexplosion at every down stroke of the piston. In order to accomplishthis. the puppet inlet valve has to be thrown out of action, the exhaustvalve has to be closed at an earlier stage ofth'e up stroke of thepiston, the sparking arrangements must be speeded for twicea's manyignitions, and separate inlet passages and valves have to'be.

' opened. These changes are secured by-sliding the camshaft, and byop'eningseparate inlet valves. All these functions .I accomplish by thethrow of a single lever.

In Fig. 1 is shown thecylinder 1, the crank case2, theinlet pipe 3, theinlet pup pet valve 4, the spark plug 5, the exhaust valve 7 and theexhaust pipe 8. The inlet and exhaust valves; and 7 are bothmechanically actuated by the cam shaft 9 having cams 10 and 11 which asthey revolve lift the rollers 12 and 13 mounted upon the valveonceduring each revolution of the cam shaft. This commutator causes thespark plug to ignite the mixture at the proper moment.

Upon the cam shaft 9-is mounted the driving member of a water pump 19which causes the water in the water jacket to circulate. This pump 19always works at the speed of the cam shaft.

The cam shaft is driven by a gear wheel QO'fiXed to the shaft. This gearwheel 20 meshes with the gear wheel 21 which revolves at two"diiferenbspeedsas compared with the driving shaftof the engine. In theposition of parts shown'in the drawings the wheel 21 revolves .oncewhile the driving cur'es the four cycle sequence of phases. By

stems 14 and 15. The cam 16 liftsthe'. roller 17 and closes the pair ofcontacts. 18

'shaftrevo'lves twice. This rate of speed seshifting the main switchinglever 22 the gear wheel 21 runs at the same speed as the driving shaft23 of the engine.

The engine is adapted as described to be switched from'the twojcyclesequence of phas-esto the four cycle sequence of phases"v and viceversa. The-main switching lever 22 performs this fun'ction. Tins leveris closes the passage through the pipe 34 from the roller 12 and nolonger lifts the valveis brought under theroller 13 of the exhaust thepiston. This cam 41 opens the exhaustcycle sequence, the valve 26 closesthe pasopened and the engine isin condition to employ its two cyclesequence of phases. In this and the crank case where it is compressed by.is double length so that it actuates the cirswitching lever isconnected to the valves- 26 and 27 through the link 28 and the arm 29secured to the stem 30. When" the lever is switched for the purpose ofusing the four sage from the inlet 3 to the crank case through the pipe32; and opens a passage from the crank case through the same pipe 32 tothe air inlet 35; and the valve 27 the-crank case to the cylinder.

When the switching lever is thrown to the opposite position the valves26 and 27 are condition, the mixture enters through the inlet pipe 3,and passes through the open valve 26, through the pipe 32, the checkvalve 31 the piston; then it passes up through the pipe 34, and the'valve 27 into the cylinder. The main-switching lever 22 is alsoconnected to the cam shaft 9 through the pins 36 fijxed to theffree ring37 mounted in the groove 38 inthe spool 39 fixed to the camshaft. \Vh'enthe lever 22 is switched to the right in Fig. 1 it pulls the camshaft tothe right substituting a new set of cams under the valve stems. Thisshaft should be switched at the proper moment to get the best results,and the parts are shown in the switching position. The shoulder 40 onthe cam 10 is cut away so that it may pass to the right under the roller12. While working in the position shown the shoulder passes 'underthereduced portion 41, of the. roller 12 and at any other position than theone shown the shoulder 40 would abut against the side of the roller 12preventing the cam shaft from being switched. This shoulder acts as alocking device to prevent the arm 22 from being switched at any timeexcept the particular moment selected. When the cam shaft does switch tothe right the cam.10 passes out from beneath stem. The inlet valve istherefore keptclosed for it is useless when the engine is working as atwo cycle engine. \Vhen the cam shaft slides to the right, a new cam 41valve stem 15 which opens the exhaust valve during a portion only of theup stroke of valve while the piston uncovers the port from the'pipe 34and valve 27. The cam 16 c'uit closer once during each revolution ofthecamshaft as during four cycle operation. When the cam shaft slides tothe right, the gear wheel 20 slides also on the gear wheel 21 andremains in mesh with it.

' 20 on the cam shaft.

A lever 42 may be used to switch the main lever 22.];This lever. or link42 may be op V erated by handor by a governor as shown hereafter... Thenext connection of the main switching lever 22 is to the keys operatingthe speed changing gears. The formwhich seems particularly effective isthe planetary gear shown in Figs. 1, 2 and ,The planetary gear has adriving member a pinion 43 shown in Fig. 4, which meshes with inions 44;shown in Figs. 2 and 4', which in turn mesh with the internal gear 45.When acting as a four cycle engineas shown, this internal gear 45 isheld stationary by thekey' 46 in the slot 47. The key 46 is slidably'mounted in the hole 48 in the crank case-to assist in bracing the key todo its work. The driving pinion 43 then causes the pinions 44 to rotateand travel around the i'nside of the gear 45 and carry the sleeve 49.The pinions 44 are mounted on journals 5() which are fixed in the arms51 of the sleeve 49.

"This sleeve freely rotates upon the shaft 23 in the position shown andhas fixed to it" the external gear 2l which drives the gear When themain switching lever switches the engine to the two cycle sequence ofphases the external gear 21 must rotate at the same speed of the engineshaft, and this result is secured by locking the sleeve 49 to the shaft23 and releasing the internal gear 45 which now becomes an idler. Thesleeve 49 is locked to the shaft by'the key 52 sliding, into the slot53. In this position of parts the planetary gear revolves as a unit.with the shaft and the gear 21- drives the camshaft at twice theprevious speed.

The key.52 is carried-in a slot 54 and is fixed to the spool 55. Thisspool has a groove 56, in which is a ring 57 freely mount-ed butcarrying pins 58 pivoted in the main switching lever 22 which is thusconnected to the key 52 to operateit to lock and unlock the sleeve'fromthe shaft 23.

In Figs53 and-4' are shown a governor adapted to perform the switchingfunction when the engine changes its speed due to a variation of the'load. In theoverloaded.

power station before cited, the engine slows I down allowing the spring59 to pull the gov- .115

ern'or balls 60 in toward the shaft. 'As the balls move toward theshaftthe link 61 pulls the spool 62 in Figs. 3 and 4 to-the right. andthe spool carries the ring 64 mounted in the groove 63 with it. Thisring 64 has-piv ots 65 mounted in the link 42 and causes the link tothrow the mainswitching lever 22 g to the right which switches the cams,valves andgears so tha tthe engine runs with-the two cycle sequence, ofphases. "f 1 It is essential that. the switching arm :22 act-.quic-klyso that there will be no chance for keys or cams to get half way andbind. A spring66 is used preferable to cause the arm to switch instantlywhen the right confour cycle sequence.

canoes ditions exist. Themain lever 22 hasextended slots 67, 68 and 69for the pivots 58, 36

and the link 28 to Work in thus allowing a considerable. movement of theswitching lever without disturbing the valves, cams or gears. Theswitching arm is allowed topass over the center of the stationarypivot'7-0 before it act-uates the pivots 58, 36 or' the link 28. Whenonce over the center of the.

pivot 70 these pivots and link are thrown so as to switch the gears,valves and cams from one sequence of phases to the other very quickly.This force is supplied by the compressed spring 66 which thus acts inboth directions. I I

It I will be noticed that the circulating pump 19 drives water at doublethe speed whenthe engine works with the two cycle sequence as when theengine works with the This gives an additional cooling effect when theexplosions are doubled in comparison to the speed of the engine shaft.Thev camshaft 9 is slidably mounted in the driving member of the circuslating pump by means of the keyway 71.

four cycle set comprises the valves 4 and '7. The two cycle set includesthe puppet valve 7 with the cylinder valve 72, the inlet valves 31 and26, and the transfer valve 27. These valves of course may be varied inconstruction and position so long as the two' cycle andQthe four cyclephases are pre served. It is of course possible to have en'- tirelydifferent sets of valves for the two sequences, butsimplicity of partsinduces me to make the exhaust valve 7 a member of both sets. 1 v

The compression space for the'two cycle sequence of phases, is in thiscase the crank case. It is cle'ar that the compressioncha-mber might beentirely separate, and the convertibility ofthe'engine secured. Theplunger in the compression space in this engine is the piston. It mightbe entirely separate from the piston, but simplicity of constructiondemands the present form as prefer able. This convertible principle maybe ap-' plied to a multiple cylinder engine, a rotary engine, a sin leor'compound engine, or,a single or douile actingcylinder engine, or anyother type of'engine. v p

The lever that converts the engine may be of any type desired, or it maybe any meing except when the notch permits the roller chanicalequivalent, operated directly or indirectly.

Many changes may be made in the details of the engine and theapplication of the ideas without departing from my invention. If therollers upon the valve stem should slide with relation to the cam shaft,such a movement would be equally effective in switchingthe cams. Manyother mechanical movements may accomplish the same purpose.

What I claim is 1. In an explosion-engine, in combination, a piston, acylinder, and puppet inlet and exhaust valves for the four cyclesequence, valves for the two cycle sequence, a

shaft, two sets of cams one for the two cycle sequence, one for the fourcycle sequence, 'means to switch said sets of cams alternately lntoaction consisting in a sliding cam shaft, and a variable gear adapted toalter the speed of said camshaft to suit the alternate cycles. 7 V

2. In an explosion engine, in combination, a piston, a cylinder, andpup-pet inlet and exhaust valves for the four cycle sequence,

valves for the two cycle sequence, a shaft,

two sets of cams, one for the two cycle sequence and one for the fourcycle sequence, means to switch said sets of cams alternately intoaction consisting in a sliding cam shaft,

a variable gear adapted to alter the speed of said cam shaft to suit thealternate cycles,

and a lever adapted to switch said cam shaft and change the speed ofsaid variable gear to. cooperate therewith;

3. In an explosion engine, in combination,

a shaft, piston, cylinder, valves. and elec tric ignition devices, twosets of cams, one for a two cycle sequence, and one' for a four cyclesequence, means for switching said sets into action alternatelyconsisting in a sliding cam shaft, and a variable gear to vary the speedof said cam shaft alternately for said sequences.

4. In an explosion engine, in combination, a shaft, piston, cylinder,valves and electric ignition devices, two sets of cams, one for a twocycle sequence, one for a four cycle sequence, means for switching saidsets into action alternately, consisting in a, SlldHlg cam shaft, avarlable gear to vary the speed of said cam shaft alternately for saidsequences, and a lever to shift said cam shaft, andchange the variablegear for said alternate sequences. v I

5. In an explosion engine, in combination, a shaft, piston cylinder,valves, spark plug and ignition circuits, two sets of cams, one for atwo cycle sequence, and one for a four cycle sequence, -means forswitching said sets into action alternately consist'ngin a sliding camshaft, and a variable gear to vary the speed of said cam shaftalternately for said sequence.

6. In an explosion engine, in combination, a shaft, piston, cylinder,valves, spark. plug, and. ignition circuits, two sets o'fc a-ms'cne foratwo cycle sequence, one for a'four ,=cycle sequence, means forswitching-said sets into actionalternately consistingin a sliding camshaft, a variable gear to vary the speed ofsaid cam 'shaft alternatelyforsaid sequences, and-a lever to shift said cam shaft and change thevariable, gear to said alternate sequences.

7. 'In an explosion.eng1ne,1in combination,

a' shaft, piston, cylinder, inlet and exhaust valves, a two cyclecompression device, valves therefor, ignition circuits, two cycle andfour cycle cams for said. circuits and valves, a variablespeed gear anda lever to shift said cams and gearto a two cycle sequence or to 'afourcycle sequence.

8. In an explosion engine, in combination,

four cycle cylinderinlet and exhaust valves,-

an auxiliary two-cycle compression device, 'valves therefor, two cyclecylinder valves, means to switch said four cycle valves and said twocycle valves into action alternately consisting in two sets of cams, asliding cam shaft, and a variable gear adapted to vary the speedof saidcam shaft.

9. In an explosion engine, in combination,

four cycle cylinder inlet and exhaust valves, an auxiliary two cyclecompression device, valves -therefor,- two cycle .cyl-inder valves,means to switchsaid'four cycle valves and .said two cycle valves intoaction alternately consisting in-two sets of cams, a sliding cam shaft;a variable gear adapted to' vary the speed of said cam shaft, and aleverto shift said cams and variable gear.

' In an explosion engine, in combination,; shaft, four cycle cylindervalves, a twocycle auxiliary compression space a piston working in saidcompression space con- 'nected to said shaft, inlet and transferconnections for said compression'space and the explosion chamber of saidengine, two cycle valves, and means to shift said four cycle valves .'orsaidtwo' cycle valves alternately into action, consisting in a slidingcam shaft, and a variable gear to vary the speed of said cam shaft. 2

11'.-In-an explosion engine, in combination, a shaft, four cyclecylinder valves, a

'two cycle cylinder compression space, a piston working in saidcompression space con; nected'to' said shaft, inlet and transferconnectlonsfor said compression space, and for 'the explosion'chamberof. said'engine, two

' cyclevalves; means to shift said four cycle -valves'orsaid two cyclevalves alternately into "action, consisting in a sliding camshaft, avariable: gear to vary the speed of said cam shaft, and a lever tooperate the same.

12. In "an'explosion engine, in combination, a shaft, four cyclecylinder valves, a two cycle cylinder compressionspace within the-crankcase, a piston working in said compression space conne'ctedto saldshaft, inlet and transfer connections for said 'compression space andthe explosion chamber of said .engine,'two cycle valves, means to shiftsaid four cycle valves or said two cycle valves alternately-into actionconsisting. in a slid- .ing cam shaft, a variable gear 'to vary thespeed-of said cam" shaft, and a lever'to operate the same. l

13. In an explosion engine, in comb nation,;a. set of four cycle valves,a two cycle auxiliary compression device, a set oftwo' cycle valves,electric ignition circuits anddevices for each cycle, and means toswitch said valves and circuits from one cycle to the other consistingin' two sets of cams, a

sliding cam shaft, a variable gear and a lever to operate said cams,shaft and gear.

14. an explosion engine, in combina-' tion, asetof four cycle valves, aset of two a cycle valves, a cam shaft operating saidsets alternately, awater pump for cooling said delivery of said water pump and its coolingeffect.

16(In an explosionengine, in combination, a set of four cycle valves andparts, a setof two cycle Valves and parts, a variable speed geartherefor, a cooling device, means for varying the relative coolingeffect of said cooling device in switching from four cycle (sequence totwo cycle sequence.

17. In an explosion engine, in combination, a variable speed geartherefor, a set of four cycle valves and parts,a set of two cycle valvesand parts, a coolin device, means for varying the relative coolingeffect of said cooling device when switching from four cycle sequence totwo cycle sequence.

18. In an explosion engine, in combination, a; set of four cycle valvesand parts, a

set of two cycle valves and parts, a water cooling device, means forvarying the relative cooling effect of said cooling device in switchingfrom the four cycle sequence '-'to the two cycle sequence.

19. In an explosion engine, in combination, a set of four cycle valvesand parts, a.

set of two cycle valves and parts, a Water cooling pump, means forvaryingt-he relative cooling effect of said pump in switching from fourcycle sequence to two cycle sequence.

20. In an explosion engine, in combination, a set of four cycle valves,a set of two cycle valves, 'a cam shaft Operating said setsalternately,ajwater pump for cooling said engine operated by said cam 'shaft,

means for shifting said 'cam gshaft'. from" one cycle to the other.thereby varying the delivery of-said water pump and its-cooling effect,and a variable speed gear adapted to vary the speed of' said cam shaft.

'21. In an explosion engine,'1n comblnation, a cam shaft, a water pumpfor cooling said engine operated by said cam shaft,

shaft.-

means for shifting said cam shaft from one cycle to the other-therebyvarying the delivery of. said water pump and its cooling efi'ect,lsaidmeans consistingin a variable gear adapted to vary the speed of said cam22. In an explosion engine in combination, two sets of valves, atwocycle set and a four cycle set, electric ignition. circuits, means foroperating said circuits and valves for the two or the four cyclesequence consisting in a cam shaft, water cooling devices operated bysaid cam shaft, and 'a varlable gear tovary the speed of said cam shaftand associated devices for the alternate sequences;

23. In an explosion engine, in comblnation, two sets of valves, a twocycle set and a four cycle set, electric ignition circuits,

means for operating said circuits and valves cam shaft carrying saidcams provided with a variable gear adapted to vary the speed of said camshaft, means to shift said cams and variable gear consisting in anautomatic 'governora 25. In an explosionengine, in combination, apiston, a cylinder, puppet inlet and exhaust valves for the four cyclesequence valves for the two cycle sequence, a shaft, two sets of cams,one for the two cycle sequence, one for the four cycle sequence,

means to switch said sets of cams alternately into -action consisting ina sliding cam shaft,

and a variable gear adapted to alter the speed of said cam shaftto suitthe alternate cycles both operated by .an automatic gov-.

ernor actuated by variations in speed.

26. In anexplosion engine, in combination, a piston, a cylinder, puppetinlet'and exhaust valves" for the' four cycle sequence valves for thetwo cycle sequence, ashaft,

' and'two sets of cams one for the .two cycle sequence and one for thefour cycle sequence, means to swltch said sets of ca'ms'alternatelyintof' 'action consisting in a sliding cam shaft, 7 a variable gearadapted to alter the speed of V,

automatic governor said cam shaft to suit the alternate cycles, and alever adapted to switch said cam shaft and change the speed of saidvariable gear to cooperate therewith both operated by an actuated byvariations in speed. I v Y Y 27. In a-convertible two' to four cycleexplosion engine, in combination, a variable speed shaft for the twosequences and a plan etary gear, means for switching it from a halfspeed to a full speed and back again.

28. In a convertible two to four cycle explosionJengine, in combination,a variable speed cam shaft, a planetary gear, and a sliding key for saidplanetary gear to change the speed ofs'aid cam shaf 29. In an' explosionengine, in-combinat ion,-a piston, cylinder, four cycle valves andparts, a two cycle auxiliary compression space, two cycle valvesand.parts, electric lgnition devices and circuits for each cycle, acooling device and means for varying its cooling effect-relative to eachcycle, and

means for switching said apparatus from one cycle to the other.

I 30. In an internal combustion engine, having two cycle valves andother means for scavenging and compressing afresh combustible gasduringeach' instroke and ignit ing and expanding during each out stroke;and havmg four cycle valves and other means for compressinga combustiblegas during every alternate 1nstroke,'igniting and expanding during thesucceeding out strokes, exhausting and admitting fresh gas during thenext in and out strokes respectively; means for operating said valves,means to and shift into operation said four cycle valves,'an d viceversa. 31. In an internal combustion engine, having two cycle valves andother means for scavenging and compressing afreshcombustible gas duringeach instroke and igniting and expanding during each out stroke; andhaving four cycle yalves and other means for compressing a combustiblegas during every alternate instroke, igniting and expanding during thesucceeding out strokes, exhausting and admitting-fresh gas shift out ofoperation said two cycle valves during the next in and out strokesrespectively; means for operating said valves, a cam shaft, cams forsaid two cycle'valves,

cams for said four cycle 'valves, and means to shift sa1d camsalternately into action, consisting in a shding cam shaft.

32. In aninternal combustion engine, having two cycle valves and othermeans for scavenging and compressing a fresh combustible gas during eachinstroke and ignitingand expanding during each out stroke; and havingfour cycle valves and other .means for compressing a combustible gasduringevery alternate lnstroke, igniting and V expanding during thesucceeding out st rokeslli-i exhausting and admitting fresh gas duringthe next iin and out strokes respectively; means for operating saidvalves, a cam shaft, cams for'said two cycle valves, cams for said fourcycle valves. and means to shift said cams alternately'into actionconsisting in" a sliding'cam shaft.

38. In an internal'combustion engine, having two cycle valves and othermeans for and circuits from two cycle operation.

34. In an internal-coinlulstion engine. having'tivo cycle valves andother means for scavenging and compressing a fresh combustible gasduring each instroke and igniting' and expandingduring each out stroke;

and having four cycle .valves and other means for compressingacombustible gas during .evcrvalternate instroke, igniting andeXpandin-gdurin-g the succeeding out strokes, exhausting andadmitting'fresh gas during 'the next in and outstrokes respectively,

means'for operating said valves, igniting devlces and circuitscooperating wlth said 'two cycle means and. said four cycle means,

and 'means to switch said igniting devices and circuits from twocycle-operation to four cycle operation consisting in cams adapted to bealternately shifted int-o action. l

35. In an internal combustion engine, havingtwo cycle valves and othermeans for scavenging and compressing a fresh com- -bustible gas duringeach instroke and ignit- 'ing and expanding during each out stroke; andhavmg four cycle valves and other means for compressing acombustible gasduring every alternate instroke, igniting and expanding during thesucceeding out strokes, exhausting and admitting fresh gas during thencxt'iniand out strokes respectively, means for operating said valves,igniting devices and circuits cooperating with said I two cycle meansand said fourcvcle means,

and means to switch said ignitingndevices "and circuits from two cycleoperation to four cycle operation consisting in cams adapted to be.alternately shifted into action by a sliding cam shaft.

36. I11 an internal combustion engine, having two cycle valves and othermeans for scavenging and compressing a fresh combustible gas during eachin'stroke and igniting and expanding during each out stroke; and havingfour cycle valves and" other means for compressinga combustible gasduring every alternate instroke, igmting and expanding duringthesucc'eeding out strokes, exhausting 'and admitting fresh gasduringthe neXt in and out strokes respectively; meansfor operating saidvalves, means to shift out of operation said-two cycle valves and'shiftinto operation said four cycle ating with said-two cycle means and saidigniting devices and circuits from two cycle operation to four cycleoperat on.

scavenging and compressing a fresh combustible gas durmg each lnstrokeand lgmtmg' for compressing a combustible gas during exhausting andadmitting fresh gas during the next in and out strokes respectively;means for operating said valves, means to shift out of operation saidtwo cycle valves and, shift into operation said four 'cycle operation tofour cycle operation consisting in cams adapted to be alternatelyshifted into action.

scavenging and compressing. fresh combustible gas during each mstro andexpanding during each cut stroke; and

during the succeeding out-strokes, exhaust in and .out strokesrespectively; means for operating said valves, meaiasto shift out ofoperation said two cycle valves and shift into operationsaid-four cyclevalves, igniting devices and'circuits cooperating with said two cyclemeans and said four cycle means, and

'- circuits from two cycle operation to four cycle operation consistingin cams adapted'to be alternately shifted into action by'a sliding camshaft.

scavenging and compressing a fresh combuslandexpanding during eachoutstroke; and having four cycle valves and other means for four cyclemeans, and means to switch said 37. In an internal combustion engine,havmg two cycle valves and other means for valves, igniting devices andcircuits coop-. crating with said two cycle means and said four cyclemeanstand means to switch said. igniting devices and circuits from twocycle re and-igniting having-"four cycle valves and other means forcompresslng a combustible gas during every alternate mstroke, ignitingand expandlng-j ing and admitting fresh gas during the next.

39. In an internal combustion engine, havmg two cycle valves and othermeans forcompressing a combustible gas during every valves, ignitingdevices and circuits cotiperand expanding during each, out stroke; andi. 'hHNIDg four cycle valves and other means every alternate instroke,ignitingf and ex-. 4

panding during the succeeding out strokes, 9o.

38. In an internal combustion engine, havmg two cycle valves and othermeans formeans to switch said igniting devices and tible gas during"each instroke and igniting.

1 ing two cycle valvesa'ndother means for "scavenging and compressing afresh combusalternate instroke, igniting and expanding during thesucceeding out strokes, exhausting and admitti'ngfresh gas during the.next'- in and out strokes respectively; means for operating-said valves,means to shift-out of operation said two cycle valves-and shift intooperation said four cycle valves, igniting devices and circuitscooperating with said two cycle means andsaidfour cycle means, and meansto switch said igniting devices and circuits from two cycle operation tofour cycle operation consisting in cams adapted 'to be alternatelyshifted into action by a sliding cam shaft and by a variable gear."

40. In an internal combustion engine, havtible gas during each instrokeand igniting and expanding during each out stroke; and hav-- ing fourcycle valves and other means for cornpressing a combustible gas duringevery alternate instroke, igniting and expanding during the succeedingout strokes, exhausting and ad- -mitting fresh gas during thenext'in andout strokes respectively; means for operating said valves, means toshift out of operation sa d two cycle valves and shift into opera.-'

- tion said four cycle valves, shifted by an automatic governor undervariations of speed.

41. In an internal combustion engine, having two cycle valves and othermeans for scavenging and compressing a fresh combus tiblegas-during eachinstroke and igniting and expanding during each out stroke; and havingfour cycle valves and other means for v compressmg acombustiblejgasduring every alternate instroke igniting and expanding.

during the succeeding out strokes, exhausting two cycle valves and othermeans for scavenging andcompressing a fresh combustible gas during eachinstroke and igniting and expanding during each out-stroke; and

having four cycle valves and other means for compressing a combustiblegas duringevery alternate iustroke, igniting and ex-' panding during thesucceeding out strokes, exhausting and admitting'fresh gas during" thenext in ii-DdxOlli) strokes respectively; means for operatingsaidvalves,means" to shift out of operation said two cycle valves and shiftinto'operation said four cycle valves, consisting in cams adapted to bealternately shiftedintoactibnby a variable gear shifted by an automaticgovernor under} variations of speed.

expanding during the succeeding strokes, exhausting and admittlng freshgas 43. ,In an internal combustion engine,hav-

ing two cycle valves and other means for scavenging and compressing afresh combustible gas. during each instroke and igniting and expandingduring each out stroke and having four. cycle valves and other means forcompressing a combustible gas expanding" during" the succeedingduringthe next in andout strokes respectively; means for operating saidvalves,

.means to shift out of operation said two cycle valves and shift intooperation said four cycle valves, a locking device to prevent shifting,and means to unlock said locking device at the proper moment forconversion. Y

44. In an internal combustion engine, having two cycle valves'an'd othermeans forscavenging and compressing afresh combustible gas during eachinstroke and-igniting andexpanding during each out stroke; and havingfour cycle; valves and other means for compressing a combustible gasduring every alternate instroke, igniting and expanding during thesucceeding out strokes, exhausting an admitting fresh gas during thenext in and out strokes respecduring every alternate instroke, ignitingand out strokes, exhausting andadmitting fresh gas tively, means foroperating said valves,

means to shift 'out of operation said two a cycle. valves andshift intooperation said 'fou'r cycle valves, a variablegear, acoo-ling device,and means coiiperating with said speed gear to operate said cooling;device at different-speeds for either cycle. I

- 45.. In an internal-combustion engine, having twocycle valves andother means, for scavenging and compressing a fresh combustible gasduring each .instroke' and igniting 'and expanding during each outstroke;

and having four cycle valves and other means for' compressing acombustible gas during every alternate instroke, igniting and outduringthe next in and out strokes 'respec tively; means for operatingsaid valves,

means to shift out of operation said'two cycle" valves and shift intooperatlon said four cycle'valves, igniting devices and circuitscooperating with said two cycle means- -.,and said "four cycle means,and, means to switch said igniting devices and circuits from; twocycleoperation to four cycle operation, a cooling device, and means'tooperate said cooling device at d fferent speeds for either. cycle.

. 46. In an internal. combustion engine,hav-

soaven ing and compressing a fresh coi nb'ustib e gas during eachinstroke and ignitand having four cycle valves and other "means"foFcompressing a combustible gas during every alternate in'stroke,igniting ing two cycle valves and other means for i25 ing and expandingduring each out stroke;

" and expanding during the. succeeding out strokes, exhausting andadmitting fresh gas during the-next inand 'outi'strokes respec-'-tively; means 'foroperating sald valves,

means to shift out of operat on 5211C]. two

' cycle valves and shift into operation said four cycle valves, ignitingdevices and circuits cooperating with said two' cycle means and saidfour cycle means, and means to switch said -'igniting devices and'-c'ircuits from two cycle operation to fou'rcycle operation, avariable-gear, a cooling device,- and means cooperatingwith said speedgear to operate said cooling device at 'difierent speeds for eithercycle.

4:7. In an internal combustlon'engine, 111

combination, a set of. four cycle; valves, a

two cycle auxiliary compresslon space, a set of two cycle valves,alternate ignition devices andcircuits-for the two cycles, a watercooling "device and combined means for changing its: cooling effect and,shifting said valves from the four cycle to the'two cycle method ofoperation. I

l8. In an internal combust on engine, 1n

' combination, a set of fourcyclevalves, a two cycle auxlliarycompresslon space, a set of two cycle valves, electrlcign tlon devlces'two cycle auxiliary compression space, a set of two cycle valves,electric ignition devices and c1rcu1 ts for each-cycle, awater coollngdevice, combined means for changing its cooling effect and shifting saidvalves from the four cycle to the two cycle methodef operation,including a variable gear and a .lever to vary the speed of the coolingdevice throughs aidgear.

signaturein presence of two witnesses. Y CHARLES F. HOPEWVELL.

\Vitnesses:

M nion-FRANCIS HILL,. A. P. TEELE.

In testimony whereof I'have afiixed my'f45

